Download Visvesvaraya Technological University (VTU) BE ( Bachelor of Engineering) Civil Engineering 15 Scheme 2020 January Previous Question Paper 7th Sem 15CV73 Hydrology and Irrigation Engineering

USN

15CV73

Seventh Semester B.E. Degree Examination, Dec. n.2020

Hydrology and Irrigation Engineering

Time: 3 hrs. Max. Marks: 80

Note: Answer any Fl !'E full questions, choosing ONE full question from each module.

Module-1

7:4

? 1 a. With a neat sketch, explain the Engineering representation of the Hydrologic cycle.

-0

(08 Marks)

b. Briefly explain with a neat sketch, the i) Moving average curve ii) Mass curve

iii) Rainfall hyetograph iv) Forms of precipitation. (08 Marks)

`aS

3

OR

2 a. With a Table, explain Global and Indian water availability. (05 Marks)

;-1

1)

x b. Write a note on optimum number of rain gauge stations. (05 Marks)

rz

c. The average annual rainfall of 8 rain gauge stations in a basin are 1000, 950, 900, 850, 800,

700, 600, 400 mm. If the permissible error is 6%. Determine the optimum number of rain

gauges required in the basin. (06 Marks)

0

,?

? 0

0

U

Describe how the estimation of evaporation is carried by

?

-0

co c i) Meyer's equation ii) Rohwer's equation.

..-

.IV '5

"g

E =-

O '"

U

o

-4

"

c

? 4a.

E

5

8

(.;

Time

(hours)

3 6 9 12 15 18 21 24 3 6 9 12 15 18 21 24

UHG

ordinates

(cumec)

0 115 370 510 395 315 252 231 112 127 96 64 43 25 12 0

(06 Marks)

Module-2

3 a. Explain what is evapo ? transpiration and also factors affecting evapo ? transpiration.

(08 Marks)

(08 Marks)

OR

4 a. Describe the method of determining infiltration capacity using a double ring infiltrometer.

(06 Marks)

b. A reservoir with average surface spread of 4.8 km

2

in the first weak of November has the

water surface temperature of 30

?

C and relative humidity of 40%. Wind velocity measured at

3.0m above the ground is 18km/h. The mean barometer reading is 760mm of Hg. Calculate

the average evaporation loss from the reservoir in mm/day and the total depth and volume of

evaporation loss in the first weak of November. Use both Meyer's equation as well as

Rohwer's equation. Take saturation vapour pressure at 30

?

C as 31.81 mm of Hg. (10 Marks)

a)

0

z

0

0.

E

Module-3

a. Define Runoff. Explain the factors affecting Runoff (05 Marks)

b. Explain with a neat sketch, components of storm hydrograph. (05 Marks)

c. Find the ordinates of a flood hydrograph resulting from a storm with rainfalls of 2.50 , 6.85

and 3.75cm each during success ?ye 3 hours. The ordinates of a 3 hour UHG are given below.

Assume an initial loss of 5mm ? infiltration index , 4 = 2.5 mm/hr , Base flow = 12 cumec.

1 of 2

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USN

15CV73

Seventh Semester B.E. Degree Examination, Dec. n.2020

Hydrology and Irrigation Engineering

Time: 3 hrs. Max. Marks: 80

Note: Answer any Fl !'E full questions, choosing ONE full question from each module.

Module-1

7:4

? 1 a. With a neat sketch, explain the Engineering representation of the Hydrologic cycle.

-0

(08 Marks)

b. Briefly explain with a neat sketch, the i) Moving average curve ii) Mass curve

iii) Rainfall hyetograph iv) Forms of precipitation. (08 Marks)

`aS

3

OR

2 a. With a Table, explain Global and Indian water availability. (05 Marks)

;-1

1)

x b. Write a note on optimum number of rain gauge stations. (05 Marks)

rz

c. The average annual rainfall of 8 rain gauge stations in a basin are 1000, 950, 900, 850, 800,

700, 600, 400 mm. If the permissible error is 6%. Determine the optimum number of rain

gauges required in the basin. (06 Marks)

0

,?

? 0

0

U

Describe how the estimation of evaporation is carried by

?

-0

co c i) Meyer's equation ii) Rohwer's equation.

..-

.IV '5

"g

E =-

O '"

U

o

-4

"

c

? 4a.

E

5

8

(.;

Time

(hours)

3 6 9 12 15 18 21 24 3 6 9 12 15 18 21 24

UHG

ordinates

(cumec)

0 115 370 510 395 315 252 231 112 127 96 64 43 25 12 0

(06 Marks)

Module-2

3 a. Explain what is evapo ? transpiration and also factors affecting evapo ? transpiration.

(08 Marks)

(08 Marks)

OR

4 a. Describe the method of determining infiltration capacity using a double ring infiltrometer.

(06 Marks)

b. A reservoir with average surface spread of 4.8 km

2

in the first weak of November has the

water surface temperature of 30

?

C and relative humidity of 40%. Wind velocity measured at

3.0m above the ground is 18km/h. The mean barometer reading is 760mm of Hg. Calculate

the average evaporation loss from the reservoir in mm/day and the total depth and volume of

evaporation loss in the first weak of November. Use both Meyer's equation as well as

Rohwer's equation. Take saturation vapour pressure at 30

?

C as 31.81 mm of Hg. (10 Marks)

a)

0

z

0

0.

E

Module-3

a. Define Runoff. Explain the factors affecting Runoff (05 Marks)

b. Explain with a neat sketch, components of storm hydrograph. (05 Marks)

c. Find the ordinates of a flood hydrograph resulting from a storm with rainfalls of 2.50 , 6.85

and 3.75cm each during success ?ye 3 hours. The ordinates of a 3 hour UHG are given below.

Assume an initial loss of 5mm ? infiltration index , 4 = 2.5 mm/hr , Base flow = 12 cumec.

1 of 2

OR

6 a. Explain Rainfall ? Runoff correlation analysis. (04 Marks)

b. Define Unit Hydrograph. Explain with a neat sketch, the derivation of unit Hydrograph. State

its assumption , application and limitations. (08 Marks)

c. Given the ordinates of a 4 ? h unit hydrograph as below derive the ordinates of a 12 ? h unit

hydrograph for the same catchment. (04 Marks)

Time (hr) 0 4 8 12 16 20 24 28 32 36 40 44

Ordinates of 4h UH (m

3

/sec) 0 20 80 130 150 130 90 52 27 15 05 0

Module-4

7 a. with neat sketches. Explain Band hara Irrigation. List its advantages and disadvantages.

(06 Marks)

b. Define Irrigation. What are the necessity of irrigation? (05 Marks)

c. Explain the various irrigation efficiencies. (05 Marks)

OR

8 a. Explain with neat sketch, the variation of Duty with the places of its measurement.

(06 Marks)

b. What are the different methods adopted to improve duty of water? (05 Marks)

c. With a neat sketch, explain different systems of irrigation. (05 Marks)

Module-5

9 a. Write a note on Canal classification. (04 Marks)

b. Briefly explain the Lacey's Regime theory. (06 Marks)

c. Write with a neat sketch, the calculation of Reservoir capacity for a specified yield form the

mass inflow curve. (06 Marks)

OR

10 a. Define the following : i) Gross command area ii) Cultural command area

iii) Crop factor iv) Time factor. (04 Marks)

b. Explain with a neat sketch, zones of storage in a Reservoir. (04 Marks)

c. A channel section has to be designed for the following data :

Discharge Q = 30 cumes ; Silt factor f= 1.00 ; Side slope = ? : 1.

2

Find also the longitudinal slope. (08 Marks)

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This post was last modified on 02 March 2020